Cross-browser, cross-platform plug-in for delivering rich interactive applications for the Web.

Apparently entering thus far unannounced, Silverlight 5 RC is available for download. Microsoft Silverlight is a cross-browser, cross-platform, and cross-device plug-in for delivering the next generation of .NET based media experiences and rich interactive applications for the Web.

Download notes:
* Alternatively you can download the latest non-beta version of this software.

What's New:

* Improved Template Model
* Including controls in the runtime instead of packaged in the app package
* Upload support
* Duplex communication
* Silverlight DRM streaming content